ref: 733c5d6645b133b60d304c38fcb1398f94d0618c
dir: /sys/src/cmd/ext4srv/ext4_crc32.c/
/* Based on FreeBSD. */
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_misc.h"
#include "ext4_debug.h"
#include "ext4_crc32.h"
static const u32int crc32_tab[] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
/* */
/* CRC LOOKUP TABLE */
/* ================ */
/* The following CRC lookup table was generated automagically */
/* by the Rocksoft^tm Model CRC Algorithm Table Generation */
/* Program V1.0 using the following model parameters: */
/* */
/* Width : 4 bytes. */
/* Poly : 0x1EDC6F41L */
/* Reverse : TRUE. */
/* */
/* For more information on the Rocksoft^tm Model CRC Algorithm, */
/* see the document titled "A Painless Guide to CRC Error */
/* Detection Algorithms" by Ross Williams */
/* (ross@guest.adelaide.edu.au.). This document is likely to be */
/* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft". */
/* */
u32int crc32c_tab[4][256] = {
{
0x00000000U, 0xf26b8303U, 0xe13b70f7U, 0x1350f3f4U, 0xc79a971fU,
0x35f1141cU, 0x26a1e7e8U, 0xd4ca64ebU, 0x8ad958cfU, 0x78b2dbccU,
0x6be22838U, 0x9989ab3bU, 0x4d43cfd0U, 0xbf284cd3U, 0xac78bf27U,
0x5e133c24U, 0x105ec76fU, 0xe235446cU, 0xf165b798U, 0x030e349bU,
0xd7c45070U, 0x25afd373U, 0x36ff2087U, 0xc494a384U, 0x9a879fa0U,
0x68ec1ca3U, 0x7bbcef57U, 0x89d76c54U, 0x5d1d08bfU, 0xaf768bbcU,
0xbc267848U, 0x4e4dfb4bU, 0x20bd8edeU, 0xd2d60dddU, 0xc186fe29U,
0x33ed7d2aU, 0xe72719c1U, 0x154c9ac2U, 0x061c6936U, 0xf477ea35U,
0xaa64d611U, 0x580f5512U, 0x4b5fa6e6U, 0xb93425e5U, 0x6dfe410eU,
0x9f95c20dU, 0x8cc531f9U, 0x7eaeb2faU, 0x30e349b1U, 0xc288cab2U,
0xd1d83946U, 0x23b3ba45U, 0xf779deaeU, 0x05125dadU, 0x1642ae59U,
0xe4292d5aU, 0xba3a117eU, 0x4851927dU, 0x5b016189U, 0xa96ae28aU,
0x7da08661U, 0x8fcb0562U, 0x9c9bf696U, 0x6ef07595U, 0x417b1dbcU,
0xb3109ebfU, 0xa0406d4bU, 0x522bee48U, 0x86e18aa3U, 0x748a09a0U,
0x67dafa54U, 0x95b17957U, 0xcba24573U, 0x39c9c670U, 0x2a993584U,
0xd8f2b687U, 0x0c38d26cU, 0xfe53516fU, 0xed03a29bU, 0x1f682198U,
0x5125dad3U, 0xa34e59d0U, 0xb01eaa24U, 0x42752927U, 0x96bf4dccU,
0x64d4cecfU, 0x77843d3bU, 0x85efbe38U, 0xdbfc821cU, 0x2997011fU,
0x3ac7f2ebU, 0xc8ac71e8U, 0x1c661503U, 0xee0d9600U, 0xfd5d65f4U,
0x0f36e6f7U, 0x61c69362U, 0x93ad1061U, 0x80fde395U, 0x72966096U,
0xa65c047dU, 0x5437877eU, 0x4767748aU, 0xb50cf789U, 0xeb1fcbadU,
0x197448aeU, 0x0a24bb5aU, 0xf84f3859U, 0x2c855cb2U, 0xdeeedfb1U,
0xcdbe2c45U, 0x3fd5af46U, 0x7198540dU, 0x83f3d70eU, 0x90a324faU,
0x62c8a7f9U, 0xb602c312U, 0x44694011U, 0x5739b3e5U, 0xa55230e6U,
0xfb410cc2U, 0x092a8fc1U, 0x1a7a7c35U, 0xe811ff36U, 0x3cdb9bddU,
0xceb018deU, 0xdde0eb2aU, 0x2f8b6829U, 0x82f63b78U, 0x709db87bU,
0x63cd4b8fU, 0x91a6c88cU, 0x456cac67U, 0xb7072f64U, 0xa457dc90U,
0x563c5f93U, 0x082f63b7U, 0xfa44e0b4U, 0xe9141340U, 0x1b7f9043U,
0xcfb5f4a8U, 0x3dde77abU, 0x2e8e845fU, 0xdce5075cU, 0x92a8fc17U,
0x60c37f14U, 0x73938ce0U, 0x81f80fe3U, 0x55326b08U, 0xa759e80bU,
0xb4091bffU, 0x466298fcU, 0x1871a4d8U, 0xea1a27dbU, 0xf94ad42fU,
0x0b21572cU, 0xdfeb33c7U, 0x2d80b0c4U, 0x3ed04330U, 0xccbbc033U,
0xa24bb5a6U, 0x502036a5U, 0x4370c551U, 0xb11b4652U, 0x65d122b9U,
0x97baa1baU, 0x84ea524eU, 0x7681d14dU, 0x2892ed69U, 0xdaf96e6aU,
0xc9a99d9eU, 0x3bc21e9dU, 0xef087a76U, 0x1d63f975U, 0x0e330a81U,
0xfc588982U, 0xb21572c9U, 0x407ef1caU, 0x532e023eU, 0xa145813dU,
0x758fe5d6U, 0x87e466d5U, 0x94b49521U, 0x66df1622U, 0x38cc2a06U,
0xcaa7a905U, 0xd9f75af1U, 0x2b9cd9f2U, 0xff56bd19U, 0x0d3d3e1aU,
0x1e6dcdeeU, 0xec064eedU, 0xc38d26c4U, 0x31e6a5c7U, 0x22b65633U,
0xd0ddd530U, 0x0417b1dbU, 0xf67c32d8U, 0xe52cc12cU, 0x1747422fU,
0x49547e0bU, 0xbb3ffd08U, 0xa86f0efcU, 0x5a048dffU, 0x8ecee914U,
0x7ca56a17U, 0x6ff599e3U, 0x9d9e1ae0U, 0xd3d3e1abU, 0x21b862a8U,
0x32e8915cU, 0xc083125fU, 0x144976b4U, 0xe622f5b7U, 0xf5720643U,
0x07198540U, 0x590ab964U, 0xab613a67U, 0xb831c993U, 0x4a5a4a90U,
0x9e902e7bU, 0x6cfbad78U, 0x7fab5e8cU, 0x8dc0dd8fU, 0xe330a81aU,
0x115b2b19U, 0x020bd8edU, 0xf0605beeU, 0x24aa3f05U, 0xd6c1bc06U,
0xc5914ff2U, 0x37faccf1U, 0x69e9f0d5U, 0x9b8273d6U, 0x88d28022U,
0x7ab90321U, 0xae7367caU, 0x5c18e4c9U, 0x4f48173dU, 0xbd23943eU,
0xf36e6f75U, 0x0105ec76U, 0x12551f82U, 0xe03e9c81U, 0x34f4f86aU,
0xc69f7b69U, 0xd5cf889dU, 0x27a40b9eU, 0x79b737baU, 0x8bdcb4b9U,
0x988c474dU, 0x6ae7c44eU, 0xbe2da0a5U, 0x4c4623a6U, 0x5f16d052U,
0xad7d5351U
}
};
u32int ext4_crc32(u32int crc, const void *buf, u32int size)
{
const u8int *p = (const u8int *)buf;
while (size--)
crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc;
}
u32int ext4_crc32c(u32int crc, const void *buf, u32int size)
{
const u8int *p = buf;
while(size > 0 && ((uintptr)p & 3) != 0){
size--;
crc = crc32c_tab[0][(crc ^ *p++) & 0xFF] ^ (crc >> 8);
}
const u32int *p32 = (const u32int *)p;
while(size >= 4){
size -= 4;
crc = ext4_crc32_u(crc, *p32);
p32++;
}
p = (const u8int *)p32;
while(size--)
crc = crc32c_tab[0][(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc;
}
void
ext4_crc32_init(void)
{
static bool done = false;
int i, j;
if(done)
return;
for(i = 1; i < 4; i++){
for(j = 0; j < 256; j++)
crc32c_tab[i][j] = (crc32c_tab[i-1][j] >> 8) ^ crc32c_tab[0][crc32c_tab[i-1][j] & 0xff];
}
done = true;
}